question mark lined with bolts and nuts white background made metal |
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| navigate by keyword : abstract alphabet asking assistance bolts brainstorming bright business car carpenter center concentration concepts construct decision detail diagram doubt graphic gray hardware help ideas industrial iron isolated kit letter mark marks material mechanic metal object problem punctuation query question repair screw service sign steel symbol technical technology tool uncertainty white work |
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| Question mark lined with bolts and nuts on a white background. Question mark made of metal. Punctuation mark |
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